van zile



(No Model.)

J.1V1ACCOR1V1ACK 8a H. L. VAN ZILE. STEAM BOILER. 110.446,785. PatentedFeb. 17,1891.

UNITED 'STATES PATENT OFFICE.

JOHN MAO OORMAOK HARRY L. VAN ZILE, OF ALBANY, UEV YORK.

STEAM-BOILER.

SEECIFICATION forming part of Letters Patent No. 446,785, dated February17, 1891.

Application filed March 6, 1890. Serial No. 342,852. (No model.)

To all whom it may concern:

Be it known that we, JOHN MAC CORMAOK and HARRY L. VAN ZILE, both of thecity of Albany, county of Albany, and State of New York, have jointlyinvented new and useful Improvements in Steam-Boilers, of which thefollowing is a specification.

Ourinvention relates to improvements upon steam-boilers, and moreparticularly to that class of them which are employed for steamheatinguses; and the object and purpose of our invention is by an improvedconstruction and arrangement of the operative parts to insure a rapidheating and prompt. circulation of the water and an increasedsteam-pro-A ducing capacity.

Our invention consists` (as will be more fully detailed hereinafter inconnection with its illustration, and as set forth in the claim) in thecombination, with a boiler provided with vertically-arranged hot-airtubes or fines and having a transverse flue above and below saidair-tubes connecting therewith, of a tire-chamber provided with a grate,said firechamber connecting at its upper end with the transverse flueover the boiler, and a helical coil'arrangedin said Hreehamber, with thelower end of said coil-pipe descending to connect with the boiler nearits bottom and the upper end of said coil connecting with said boilernear its top, but below its water line.

Accompanying` this specification to form a part of it there isa sheet ordrawing illustrating in a single figure a boiler containing ourinvention. This illustration shows in a central vertical section theboiler and firechamber, as well as the flue at the top of thefire-chamber connecting with the flue over the boiler, and the flue atthe bottom of the boiler with the coil illustrated as arranged withinthe fire-chamber and shown in side elevation.

The several parts of the boiler thus illustrated are designated byletterreference, and the function of the parts is described as follows:

The letter B designates the boiler, S its shell, and T thevertically-arranged iiucs or tubes therein for the downward passage ofthe hot air; F,the bottoni flue, provided with an exit E, and F2 the topiiue.

The letter C designates the re-chamber, and G its grate; A, its ash-pit;D,its damper`m door, and D2 its fuel-supplydoor; XV, the side walls ofthe tire-chamber, made to inclose a combustion-chamber C2.

The letter Fsdesignates a iiue leading from the top of the lire-chamberto connect with the flue F2 at the top of the boiler, said flue beinginclosed by the roof-plate P', connecting with the roof plate P2 of theiiue F2.

The letter K designates a helical coil of pipe, which at its lower enddescends to connect with the boiler B at k2, and which coil at its upperend rises slightly to connect with the boiler B at 7c3 below thewaterzline L in the latter, said coil being arranged within thefire-chamber C.

The letter p2 designates a steam-pipe connecting with the steam-gagepipe p3 at one end and at its other end connecting with the val ve V,which latter is provided with a pressure-lever Z, that is weighted atwg, is pivoted at p4, and at its long arm connected with the upper endof the chain d, with the lower end of the latter connecting with thedamper-door` D', so as to operate the latter by the measure ofsteam-pressure in the usual manner.

The letter Gr2 designates the steam-gage arranged on the steam-pipe p3,which latter connects with the boiler at p5, and the let-ter Idesignates the water-gage arranged on the pipe p3, to show the height ofwater in the boiler.

The letter J designates the water-feed, and R the return-pipe.

The operation of the boiler thus constructed and arranged is as follows:The water in the boiler B is heated bythe descending currents of hot airpassing through the tubes T, while a circulation and additional heatingis produced by the action of the coil and its connec tion with theboiler, which circulation makes the operation of the boiler morepositive, which is of great advantage in boilers of this class.

Ve are aware thata water-heating aud water-circulating coil has beencombined with a irechamber and connected with a water-reservoirsurrounded by a descending iiue that encircled a part of the reservoir,with the npper end of the latter projected through the flue whichsurrounds it, and we are also aware that a boiler made withvertically-arranged dues passing through the boiler is an oldconstruction. Our invention dili'ers from these older construct-ions inthe fact that the fire chamber ot' our apparatus and that in which thewaterheating and eirculatiingcoil is placed connects with the Verticalilucs of a boiler by means ot' a horizontal tlue passing; from the topof the tire-chamberover the boiler-top. so that the heat coming from thetire-chamber may circulate over the top of the boiler and down throughthe boiler-tubes in contradistinction as to a flue passing around a partof a reservoir projected downwardly into a tine, or up through the tubesof the boiler with the fire beneath, in neither of which older devicescan the coil cooperate with the same means for heating the boiler as inthe arrangement which we illustrate and describe.

Having thus described ourinvention, what we claim, and desire to secureby Letters Patent, is-

The combination, with a boiler havingT ver tical descendingIlttes,abotto1n luc provided with an exit and connectingwith the lowerends of said vertical lilies, and atop tine conneetiir;71 with the upperends thereof, of a lirechamber provided with a top ilue connecting withthe topilueot' the boiler, a helically-coiled pipe arranged within saidlire-chamber, with the lower end of said coil eonncetin,r with theboiler near its bottom, and the upper end of said coil connecting withthe top ot' said boiler below its water-line, substantially in themanner as and for the purposes set forth.

Signed at 'lro i', New York, this 26th dayof February, 1890, and in thepresence of the two witnesses whose naines are hereto written.

JOHN MAC CORMACK. HARRY L. VAN Zllil).

"Witnesses:

('HARLEs S. BmN'rNALi., W. E. HAGAN.

